Study on the Adsorption Capacity of Chitosan Coated Bentonite for Acid Blue Dye

2011 ◽  
Vol 71-78 ◽  
pp. 1123-1127
Author(s):  
Hong Shao ◽  
Ying Chun Song ◽  
Di Zhang
Keyword(s):  
Organic Contaminants ◽  
Raw Materials ◽  
Chitosan Solution ◽  
Blue Dye ◽  
Deacetylation Degree ◽  
Stirring Time ◽  
Microwave Time ◽  
Acid Blue ◽  
Single Factor Experiment ◽  
Solution Volume

Chitosan coated bentonite (CCB) was prepared by microwave irridiation, original bentonite as raw materials and chitosan as modifier. The adsorption performance in acid scarlet dye solution was discussed. Firstly the optimum adsorption conditions: concentration of chitosan of 35 g/L, bentonite quality and chitosan solution volume rate of 0.7(g/L), microwave time of 17 min, infilltration time of 50 min, deacetylation degree of chitosan of 85%, soil particle size of 15 mm, pH of 5, dosage of CCB of 20 g/g, stirring speed of 300 r/min, centrifugal time of 15 min, and stirring time of 35 min, were investigated by single factor experiment. And the maximum adsorption rate reached to 96.2%. Subsquently, all the effect tendencies of the physicochemical parameters of the preparation and adsorption were studied on the optium experimental condition, which would provide reference data for the subsequent pilot test. The results suggested that CCB was a promising sorbent to remove organic contaminants and might be utilized to purify water contaminated by organic compounds.

Utilization of eutrophicated Lemna minor for biosorption of acid blue dye

2021 ◽  
Author(s):  
P. Prakash ◽  
J. Aravind Kumar ◽  
Balaji Dhandapani ◽  
Dhanya Vishnu ◽  
S. Hrishitha Sree ◽  
...  
Keyword(s):  
Lemna Minor ◽  
Blue Dye ◽  
Acid Blue

scholarly journals Effects of the Origin and Deacetylation Degree of Chitosan on Properties of Its Coatings on Titanium

Coatings ◽  
2020 ◽  
Vol 10 (2) ◽  
pp. 99
Author(s):  
Milena Supernak-Marczewska ◽  
Andrzej Zielinski
Keyword(s):  
Titanium Surface ◽  
Surface Oxidation ◽  
Chitosan Solution ◽  
Biological Properties ◽  
Contact Angles ◽  
Biological Behavior ◽  
Water Contact ◽  
Deacetylation Degree ◽  
Oxidation In Air

The properties of chitosan coatings on titanium surfaces may be influenced by a variety of factors, including their chemical characteristics and the deposition method. The aim of this research was to determine the influence of a chitosan’s origin (a type of shrimp) and deacetylation degree (DD), when deposited on a very smooth titanium surface, on adhesion and biological behavior. The tests were performed using chitosan of a degree of 87% or 84% of deacetylation and that originated from armor crabs or shrimp armor. The technology of fabrication of chitosan coatings was by surface polishing to a smooth surface, oxidation in air, and immersion in a chitosan solution. The surface topographies were analyzed with an atomic force microscope and their water contact angles were measured by a falling drop method with a goniometer. The bioactivity tests were done in in vitro on osteogenic cells, type MC3T3-E1, with a biological microscope. The abrasion of the coatings was examined using a nano tribotester. The obtained results revealed that the adhesion of the coatings onto a smooth, oxidized titanium surface is appropriate as they remain sufficiently adjacent to the surface after wear tests. The source of chitin has a significant influence on biological properties, and the deacetylation degree is much less critical. The performed tests demonstrated the crucial role that the source of chitosan and the applicability of the applied surface treatment play in the preparation of chitosan coatings.

scholarly journals Prepared 13X Zeolite as a Promising Adsorbent for the Removal of Brilliant Blue Dye from Wastewater

2021 ◽  
Vol 22 (2) ◽  
pp. 1-6
Author(s):  
Suondos K. A. Barno ◽  
Haider J. Mohamed ◽  
Siham M. Saeed ◽  
Mohammed J. Al-Ani ◽  
Ammar S. Abbas
Keyword(s):  
Raw Materials ◽  
Brilliant Blue ◽  
Blue Dye ◽  
Maximum Adsorption Capacity ◽  
X Ray Diffraction ◽  
13X Zeolite ◽  
Equilibrium Data ◽  
Pseudo Second Order ◽  
Zeolite Adsorbent ◽  
Adsorption Equilibrium Data

The research discussed the possibility of adsorption of Brilliant Blue Dye (BBD) from wastewater using 13X zeolite adsorbent, which is considered a byproduct of the production process of potassium carbonate from Iraqi potash raw materials. The 13X zeolite adsorbent was prepared and characterized by X-ray diffraction that showed a clear match with the standard 13X zeolite. The crystallinity rate was 82.15% and the crystal zeolite size was 5.29 nm. The surface area and pore volume of the obtained 13X zeolite were estimated. The prepared 13X zeolite showed the ability to remove BBD contaminant from wastewater at concentrations 5 to 50 ppm and the removal reached 96.60% at the lower pollutant concentration. Adsorption measurements versus time showed 48.18% removal of the dye during just the first half-hour and the maximum removal closest to the removal at the equilibrium after one and half hour. Langmuir isotherm was described the adsorption equilibrium data with a maximum adsorption capacity of 93.46 mg/g and the kinetics data of the adsorption process was followed the pseudo-second-order.

scholarly journals Preparation of modified magnesium hydroxide and its application in PA66

2020 ◽  
Vol 185 ◽  
pp. 04054
Author(s):  
Hong Chen ◽  
Bao-Wei Zhu ◽  
Haiyan Liu ◽  
He Yang ◽  
Li-Peng Jiang
Keyword(s):  
Sodium Hydroxide ◽  
Magnesium Hydroxide ◽  
Raw Materials ◽  
Nitrate Solution ◽  
Magnesium Nitrate ◽  
Precipitation Method ◽  
Reaction Conditions ◽  
Nylon 66 ◽  
Optimal Reaction ◽  
Solution Volume

In the present study,the modified magnesium hydroxide was prepared by precipitation method using Mg(NO3), NaOH, and silane coupling 702 modifier as raw materials. The optimal reaction conditions were obtained as follows: sodium hydroxide was added to magnesium nitrate solution by dropping, the dropping speed of sodium hydroxide was 2ml/min, the reaction temperature was 60℃, and the ratio of modifier dosage to total solution volume was 7/100(g/ml). The oil absorption value and XRD were used to characterize the modified Mg(OH)2. In the application, the modified magnesium hydroxide was mixed with pentaerythritol octahydrogen tetraphosphate(PEPA) and applied to nylon 66(PA66).The flame retardancy and mechanical properties of the nylon 66(PA66)composite were studied.

One-step Solvothermal Synthesis of rGO/TiO2 Nanocomposite for Efficient Solar Photocatalytic Degradation of Methylene Blue Dye

2018 ◽  
Vol 15 (2) ◽  
pp. 157-162 ◽  
Author(s):  
Valerie Ling Er Siong ◽  
Chin Wei Lai ◽  
Joon Ching Juan ◽  
Kian Mun Lee ◽  
Bey Fen Leo ◽  
...  
Keyword(s):  
Electron Microscopy ◽  
Methylene Blue ◽  
Graphene Oxide ◽  
Organic Contaminants ◽  
Primary Objective ◽  
Blue Dye ◽  
Light Illumination ◽  
Potential Candidate ◽  
Adsorption Sites ◽  
One Step

Background: The discharge of effluents from the textile and dyeing industries has been a worldwide concern. Although reduced graphene oxide/titanium dioxide (rGO/TiO2) nanocomposite is a potential candidate for wastewater treatment, the influence of graphene oxide (GO) content on its physico-chemical characteristics and its subsequent photocatalytic capabilities in degrading the organic contaminants has not been well established. Objective: The primary objective of this study was to assess the use of rGO/TiO2 nanocomposites with various GO contents for the removal of toxic methylene blue (MB) dye from aqueous solution. Method: In the present study, rGO/TiO2 nanocomposites were fabricated using various GO contents through a one-step solvothermal method. The effect of GO content on the nanocomposite formation was investigated by using field emission scanning electron microscopy (FESEM), transmission electron microscopy (TEM), X-ray diffraction (XRD) and Raman spectroscopy. The resulting nanocomposites were evaluated against MB degradation under artificial solar light illumination. Results: Based on the photocatalytic results, the highest removal percentage of MB was achieved by 0.15rGO/TiO2, which was about 1.7 times higher than that of 0.01rGO/TiO2. The enhanced removal efficiency of MB by the nanocomposite with the highest GO content (0.15 g) was attributed to the increased active adsorption sites, which greatly promoted the π- π interaction between the aromatic rings of MB dye and the graphitic skeleton of rGO, as well as the electrostatic interaction between the cationic center of MB molecules and the residual oxygen functionalities of rGO.

scholarly journals Nut Shells as Adsorbents of Pollutants: Research and Perspectives

2021 ◽  
Vol 3 ◽  
Author(s):  
Maria I. Papadaki ◽  
Didilia Ileana Mendoza-Castillo ◽  
Hilda Elizabeth Reynel-Avila ◽  
Adrian Bonilla-Petriciolet ◽  
Stavros Georgopoulos
Keyword(s):  
Large Scale ◽  
Natural Waters ◽  
Activated Carbons ◽  
Raw Materials ◽  
Environmental Benefits ◽  
Added Value ◽  
Gas Generation ◽  
Cashew Nut ◽  
Bio Oil ◽  
Acid Blue

Shells, kernels, and other wastes have been investigated by researchers as potential adsorbents for a number of pollutants like methylene blue (MB), Remazol Rot RB, acid blue 80, acid blue 324, or as raw materials for the production of activated carbons and biochars to serve the same objective. Activated carbons formed by such wastes have been found to remove different heavy metals like uranium, arsenic, and cadmium while their biochars removed others like lead and copper. Furthermore, the production of these adsorbents can be combined with additional ways of valorization of this type of waste like bio-oil or bio-gas generation or even added-value materials extraction. In this work, conducted research on the ability of pistachio, pecan, cashew nut, and castor seed shells to selectively adsorb and thus remove pollutants from synthetic wastewaters is being shown. This type of research needs to be expanded in order to incorporate competitive adsorption, adsorbents regeneration, and recovery of adsorbates and to evaluate their performance with real wastewaters, before they find their way to large scale applications for the removal of the respective compounds from natural waters and wastewaters. An appropriate life cycle assessment is also necessary for the evaluation of the environmental benefits arising from their use.

scholarly journals Mathematical Approach for Estimation of Alginate-Iron Salt Solutions Viscosity at Various Solid Concentrations and Temperatures

2021 ◽  
Vol 9 (1) ◽  
pp. 75-87
Author(s):  
Indrasukma Permanadewi ◽  
Andri Cahyo Kumoro ◽  
Dyah Hesti Wardhani ◽  
Nita Aryanti
Keyword(s):  
Raw Materials ◽  
Surface Active Agent ◽  
Active Agent ◽  
Physical Models ◽  
Solution Viscosity ◽  
Effect Of Temperature ◽  
Release Agent ◽  
Alginate Concentration ◽  
Stirring Time ◽  
Pharmaceutical Industries

Alginate has been widely used in the pharmaceutical industries as tablet binder and disintegrant, release agent and controlled release drug delivery system. Whereas in the food industries, alginate is generally employed as thickener, emulsifier, stabilizer, texturizer, formulation aid, firming agent, flavor adjuvant, and surface-active agent. As one of the important raw materials in the functional food preparation, iron is hard to manage due to its vulnerability to oxidization, degradation and possesses a strong unique aroma. Considering its superior coating and release properties, alginate gel can be the best choice to preserve iron from various undesirable effects. Unfortunately, there has been lack information in the published literature to estimate the effect of temperature, concentration, and stirring time on the mechanical properties of alginate. Although many mathematical models have been developed based on these factors to predict the viscosity of the alginate-Fe solutions used as feed in spray drying application, no clear information have been reported for their accuracy. This study aims to examine four physical models for their suitability in estimating alginate-Fe solution viscosity, namely the Walther, Mark Houwink, Vogel – Tamman – Fulcher (VTF), and Intrinsic models. Prior to model validation, alginate-Fe solutions containing alginate: Fe (2:1) mass ratio were prepared. They were heated to desirable temperatures (30°, 45°, 60°, and 75°C), stirred for various stirring times (0 to 60 minutes), and subjected to viscosity measurement. The results exhibited that the viscosity of alginate-Fe solution with 5% alginate concentration stirred for 15 minutes at 30°C reached 320 cP. Whereas the viscosity of Alginate-Fe solution with 1% (m/m) concentration at the same temperature and stirring time was only 250 cP. This observation suggested that a higher alginate solution concentration leads to a higher the viscosity. As expected, a higher temperature and longer stirring time resulted in the decline of the Alginate-Fe solution viscosity. Although the proposed models demonstrated the similar trend, it can be concluded that the Walther model was proven to be the most accurate model used for the prediction of the Alginate-Fe solution viscosity compared to the other models as shown by its highest R2 value, which was 0.987.

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